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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e896dedbf608130f4df8806f74839125587c72fcfd95f2a80e35d7b2e4efd1' 
  AND token = 'wi35tgFGw9mnrZaU3qT0ljRIaS1P0YEfffjzQNOd+po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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