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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '010080c08537b403035271e83296d6e4e042da04edf59c62744f6219d7b185e5' 
  AND token = 'L8MGBJSQsz5bcd8Kz+FXZzIuRvna0E3ebo1EapF3xO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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