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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1976d4ab6afdd7bbd7e73ae78d6ff7c0203a4a4deb9e4077b34620dca0ede34f' 
  AND token = 'FdYJ7FjOggbu1G+dNwTk9s7qW6NxBKbyIflo0yFHyak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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