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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c2dd1e3f6d74d9d5689ccd0e174ae777370d3bcf6bb0ccbbaa838563dc6ec6' 
  AND token = 'SmNYR/GO0lpIBWFateHGySB620FcMm0TWEisuCh6mQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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