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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f50b6f7d3a30d2735c9a117922a5786cfd054a7e70e249805ebcf9a2e4eaa3c' 
  AND token = 'ozWaW7eTYOSphF9nL2i3jdjZeCVvPPcaJlFhA04P0yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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