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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ed12a41587c4b8b88c37204d750ff87c040f43b1a05424d07fa7923ff75601e' 
  AND token = 'AH3e8W8gqwz4w8hdLjVMYxMJqYiqo8RDpL6EI46cqS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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