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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e1761fbcb6234b3f2655167a7b1dc291e0885ce748cab4a73ec4cb358835dd' 
  AND token = 'hGSqAmJtkR4C45F2SV+IhiTylclLTRE+9+DTSGVRQ/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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