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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5d361d8f325438af074a550761130031cd7ecf8cd7c783c33d9ea5280bfd75f' 
  AND token = 'UVtV8ZUR0jj9OR2bOJKfrh5XyAA0boX3T3uxtmL6PUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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