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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd04aea00a97aca9d2246aef2c903b4380a501c074dae592343812dc99d4924e1' 
  AND token = 'kMGnWG0N6ELGDsva9bhEfz+xUem3KvjBD959XaTH57s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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