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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ee9c64290f64bac0349c90aca76d24b381455aae2a7db3b2c4c883be6d3947' 
  AND token = 'kmF9UAUdwzu4jjAcUaLTe57k308KWfNIid5vsptzuhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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