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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8da8e9bcc76f65fc71dcd25d2d94c856a3de05504dc1fe54554c1e376b47f47d' 
  AND token = 'tt/T9yjJx9yHV1neiFb+t5tjALYKrEsWPV5CQI2Clds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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