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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f98c7a4d35bfbec8aa82cf1e0bcfe71fa85f4fe07acaa9d01a02124b54f8d19' 
  AND token = 'V5JNr54GZnIKEnpuIpCSfGY5EeETltIs9qJjVV2L9Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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