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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '739ef3f2ccc7b25799abdcc57cf75bad59598fbc268e3da0be6c20f5d10cfc3e' 
  AND token = 'VvExfOBl6CSMJqrY9tbZtpl/ib+bH40oBk+Pb0NVlTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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