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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8dca768bf20f0b60e73388d6ede54fb03a3a5b7a3b17ebe658064da5080995' 
  AND token = 'nO9c1XFYzI4dqpVk5IlhSyA1qtfO9ShHxkqO//4heBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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