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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '510003c1b923f9c14ab1e7593320b75ab8f6c59f2a02533332c5d717c176f1cd' 
  AND token = 'CzvWrXCAKT15WWd0Gkhm17kJDwSg/KTGuPFTuoWc9xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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