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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87ef12cfc47e8ef8a0768e557b9aa3fef93c361ac99b77b8f02470b036a620fc' 
  AND token = 'PAVv5ibKr9tEifwUhXE2u3KGCjLj5KN3oBujgOSD0wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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