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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf1e603daa6975221d5a1b3654e88a48ee7e7c1506e37b8a35c1804fdb875ac3' 
  AND token = 'jb8hCp48abjdj6zTD8Rh5J3a9E09vHVn4vC4k07iXzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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