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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b65e1bd2e0d8bcfacbe508ef051928d9499e5a9b26259088a5642818ded466' 
  AND token = 'UIVElVSpZ2SrOrryWFXBpmTY2J8Avom+INVMv7Eopg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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