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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe8c897845ef770312ff6bc7a0eebb63997f8120f3ff0c32e275ddb7058c1b2' 
  AND token = 'hgayt6h40J5+Z1EQKRQrL9GmANhmzV0v5Uyg0fME8ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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