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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '332cb77125dcdf4bd8b2de01f9251d75427d8839ed8a57d61e3dfa422881c4b1' 
  AND token = 'M7w+yg2o2o7zuW928dtL3e1cTtKVkuh06n4PhJMOqng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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