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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbd607cf2f8857968a3cdfaa40b46d23bf9a172f90d496dc39ca2aa53ad8d996' 
  AND token = 'MO4uo4UMNYnhoXGIllUw/r9qPWo+d7UU5OiDXwWgSg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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