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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61be114ac03d17d0731b1f0ecdbb7b74836ecf6d6053a2c1fb04677a3a2109e3' 
  AND token = '+4l2CzCoo7fi7paaPL0jiLsQ546Pdbga3htExJXmhXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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