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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0097fd4e0807e60a7098d9dc943e84275a93752ac545e5170b32124b511d91f' 
  AND token = 'heavcohU2GFufQJwuUbwd0XEIy6mYgbNO3H3YEc5Pak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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