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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8734b2e911dac81894a0678ba8111c18f0794c0879f8abdaa2115edcd3e6d374' 
  AND token = 'i9tNQRn1t+73txSkm83J6elE8xHpJrYDOokMTSL0MvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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