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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2dc27ee4b7252795619d4d9743d417e080e8294c73f131c41370846e620e5ba' 
  AND token = 'A3o1wwz5qr0kdYtwvw/W4DN69n7YKMaNon+ecPw3l70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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