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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe3ca2407e45cce35ca5d33c8f54ed266427ee9b587b8e5e18d91bf30005e1d5' 
  AND token = '/2BeI4bw3f1y6seukLUEWHF2+Lid/H2m+gszlGf9Veg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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