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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '264a7ff5ef9b28da4d308353ed663939a460500a096bffdac7b3333236b7eda4' 
  AND token = 'NIs/RaPwZem9681lkNRzCIpxQ9130N4ssVhY2Nl7mjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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