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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b00a0fe1bd2cfd017bf4bb1a206e8f2202a0daecc0dde8e7b5e7175a8c8363fc' 
  AND token = 'R0LOsjsABAexV2lsc/KorIGWyfLBNf5m8yA0OyPVWCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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