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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c55627ef287098bfb5cd5842ad1d0106d1c5dbe87148c34b44e068c19f7b6e53' 
  AND token = '9lPBeFIPMBI2dOHvseapM0xetzutY4WFguCkOMZ3WoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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