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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '986779480929d951e2ebfb95b9ed80ada5117ac938458a155595f3ae3d70c4c9' 
  AND token = 'BqlSIH4uvwUBXogTw4FgBMr9PY1L2hz+2TH90oT9vkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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