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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d26e3b30af41540f938c2e116ef1ff56507f3a603673775553d48cde4f37ba' 
  AND token = 'AyuH7WbWrPrRRmaA320cd3Ieiz36yL4/ziOEtt+w3Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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