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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '329209909a91a289467048a41128e2b12727b3240c24c76ce4cda0680df380fb' 
  AND token = 'b9pZPoSU1p6W6TdCGJl9kbbkZ230COAzhekA9b2APlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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