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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523a32287110fb921af988880f89ae2e7d3a5b0e2334e76af942e5349d7c010e' 
  AND token = 'NZd5ZSwE5ZYTYTkyBYOvK2C7JUpEaC+gSrV7yS8Ylok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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