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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df3089fab9751d07c0f6087b61661a8aed61ea53bf4a0b40620cf4e01d95b9c2' 
  AND token = 'TBaxqtIGGA6WpPJoDywLDIPKybUpFtrNQ2/LdSEWNTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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