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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3191082c10902b237fe8fbb539f2ac6dd2ee3c82c1c6cab3ee3947c7e2592f' 
  AND token = 'ljHCuYotLzq1XI5m5+24GTNCPtSPKtnBkOYDWRrIhu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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