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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fb672c21bc34a77f40a7f221765460bc0afb2ed019c3a499d1b95b2a2fd7689' 
  AND token = 'M6awJRkDFmLZqvH41FvlTUufeOW9yqmJyWD4GzlVJvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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