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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13f2da2926f5a336f851916fb0a0181e5a8be0fe1fd976c46e6561149e5aac8' 
  AND token = 'SBr9l3KKUA/6jvUI2H+Zxir+HfvUg5Rt+6BHv3gJZ8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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