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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '274cb1d16d15f198c3e2b87d31d9517e81fa53ea1704de26dfe561bd2d8156f0' 
  AND token = 'qX6er7vvGyt/FrAmQpIngsks+HfN4U5EPHj2l8F15WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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