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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '067f27182797b5c5784c65bddb9915568deaf40d3fcf7ae98d906a22ff3a919c' 
  AND token = 'kKzkutE1wf+487eFgwXk42mbf9G57fNdmH8A/r/ognA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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