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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1955ecd71cac349dbd264a0d685c11434e68a76b75a9b803aac13cba046c547' 
  AND token = '3nlty+LnqisJhF8HQH73kpKAPOel116PMMAQjBt4Z5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

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