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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f38ca41b51c27a1d27d012bf901d99a9c09b691a1334040427599d42613c8be' 
  AND token = 'y4XS3bMQW7ovftv+e4oo3kdCFnme9uc/pwo95D5VEXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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