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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd455a44f0764e9ff1d24ba35bf54db888c5a86cff12abde4eba2d28d604c8dcc' 
  AND token = '4zFvXEbC5uoUDGbYKJ7D4txzyEX6Pm056SDniRuoOGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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