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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928efe904869dae02d88b9ff83c1b91ce1260d30bced4b795634dffe452e3235' 
  AND token = '9ZMIwsr0jMiOtHSB3Gf9ZGv11Wl5gOWoQSBe/43XX98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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