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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b81b5abffa0611e35eab0879d1cedf0ccef66c9a25b9aa1ddd7f828bd1ef8f' 
  AND token = '0jVPxG7KXkLWz/NQMqi4LP6KCRfSoctJJz4wSL5TY3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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