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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '792325a065181191caee3e1e6dbbdff7fbe2f5cd756f7f727b1c06acea4135fd' 
  AND token = 'SRAn9/PUX8I9yDEpbO/CjWPr/cV9jNAaq3b0Ed56xug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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