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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7399d0303fc03ee6d8cb69d2599acdd245583cf1952da67c69964d0fc3e38f29' 
  AND token = 'n3xo7ujaQLmXcag0VfCbmu5CPHAb57Ug5XyUL9KLDKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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