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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '430dc2f828a02ac214e4aed220563875e86c6cfbe28ebaadabee2c408c97d183' 
  AND token = 'Mh34mecQ7Imr/ekmS89Z32xE+paMa2UEOu93ZDU60OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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