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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e04690719723e4fc484c6f3ac6de77ec64d40c1883fef5fad699728fb2642ff1' 
  AND token = 'PYziROyw1wb56iWbZdPxA6ruv8Ud0a61+0LgLd/SzkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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