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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02976764a3e40ebbeb55cc1c2c54214f68d7fe32ae292f6324df11bb545dc29a' 
  AND token = 'S2rODFUsbq8JhEElttAZ6cpg31c6Y3bISx3kYq2J7/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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