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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d45d0fe5a3bca2b464fe8efec8a2e19b5885f0d2bb61ff8b88af2c4a55e1eb7' 
  AND token = 'ytzcVbd8K18opvfA1HOaei4nq/XZFD8+rTLocLN0esQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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