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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '582a5c694bd8c82d4842702bb848f37563f400beaddb6b70741de63cc80bdd8e' 
  AND token = '8QFx1VIj3faq0sC1yYr0X3CcstJlXGZrl1/UlGUkdaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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