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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b627a79ed2d094c1b0323fca44d18363dcb7b5ad70f077f1ecf68a7ba08e66dc' 
  AND token = 'Ix7FCYku6UYDwpun+9YNwvZ7H38OSgrMFOb/owO5uxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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