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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d26979e538f0f7c760cb9480a35a205d238cf766c617d0b55907c1b179ce347' 
  AND token = 'GGuEy+ovfO+nonR21N7iQw77e7BK+tsjwfVby4pJT+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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