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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad24d8dd529855923d0bb1a5ca1d092fa49d7c3c58898812bc4466622d96320' 
  AND token = 'p/7oC2DxvSGhy73We/uiyFOba7vYk59c8sF8BRog8vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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