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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15077e6d2bfa23cc8d4d33ed7026d737ec257b43da41d3d06560d1feca938537' 
  AND token = 'ibuc6gikJoeCj95Op0ZhqjPnfWe2S61nGl+k6MXcoq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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