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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffee5a2a13a761ac00fa0a0c1065f33a74aaefc2681f3698f3b98730e81a2ffd' 
  AND token = '9lXnuh13cDJEWuDlhKytkr5+fypka783eQSjC962hSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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