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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '165fc3f3773c9a5e9a4632c5b53097a781df6c69ba1a933581cf9900ffaf9baf' 
  AND token = 'LgbnHm8mgwa7/US3nCXJSiSrccSbZp/76LPFGw99mlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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