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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94284241719cfc159319c59a982c5f8ce39fe1c509414d014d559a4d462cd566' 
  AND token = 'aGaHaXnXIhK07MX/q1t1by5lTLtCJGOLLpyG4mTaY54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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