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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7a3c529a8e7a2f41fce45794b8e30f922b97929f25d0e90b493d267d950ed1f' 
  AND token = 'aJdHmEYj/8faPBhM0ZP267PdAkLsbVDl7/viJaFUG7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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