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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238d8d1c09d1bb88a9b80c553641ae4d0f21a4637a945558ea8b09f7ab904508' 
  AND token = '+MmUgN7EgOwPHda6MMrFCBCoLbyZUkrkvoiN7WT6bmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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