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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb8faa8745cdd0971cfab860e2bb3c4a2c7540cab401c267f8b80eff2df8447b' 
  AND token = 'zg27SlCf1eMcf7zl7yt+rL+XVvpsvFpaKdmaORLDrY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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