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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb46aad7deeb3159607a745e57ba8ac32ebeafd89a54984cc0e96f283da6bdc8' 
  AND token = 'mCqKRAJSpv/WLeSdtY/Lh+Mf3Y6ti006SQ+tH5r5+yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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