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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '919e1ea3a0c50ebf7a6af9d1b3f8e69ea291983bbc8ca2c9a3da9b038cc24798' 
  AND token = 'vx4tFH3HtcyPOz9Yt2HEEAzeEHrlReW2rlzWcquLwUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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