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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d49869cd4fd5109b56bf835ec77c1d2db4ee1a94189941d1e498c3988f73317' 
  AND token = 'pH/wzEZEndY8Q6Xsp+jM5WGu+hLeMyU7r/9TM8TMvH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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