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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd9fd851f2980c78b8d0d828b55b68b21c81157b8785531f9ff271cc4a482781' 
  AND token = 'WVb6S8GLvmiMWgzhQc5FChlCakm/5+cY0SrvGMkUBEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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