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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a67688fba5f3caf999261bdfeda1d889636cc80013520228cf2a463d4c3a0f8' 
  AND token = '5w/GB51oPJRTlivk+F7ndtC3Yx5oJoMEXOROHyZK3yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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