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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec8d3e18e4481f744ca76b982edf8c17c5b67eda4d9a5600b63df5610fa307c' 
  AND token = 'eHx/d/Nn0oNvZYOlklUQjrLGzapi0qMwO16nAQljR64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}