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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0247be9daa4d973d1e0b4469cd4d84a4fbd3e4eae1e982bf8e573b5a82e3525a' 
  AND token = 'Zu9+uP6IZ0tP0jQDsw+4RbCVVVUs9wDuBwNFw/UheaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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