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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b5313775390477f2a4d8be2fd12b23a75082edbe8cb15ec434f7038cd1c8c3' 
  AND token = '3blsJFsYOtsBUR0TPV7Fy5+K11yLPwPMY8hSZI+++q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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